[ImgBot] Optimize images (#2)

*Total -- 5,389.76kb -> 3,361.25kb (37.64%)

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/Documentation/HElib/html/doc.png -- 0.73kb -> 0.72kb (1.34%)
/Documentation/ML-HELib/html/doc.png -- 0.73kb -> 0.72kb (1.34%)
/Documentation/HElib/html/classhelib_1_1_logic_error.png -- 0.74kb -> 0.73kb (0.4%)
/Documentation/HElib/html/classhelib_1_1_encrypted_array_derived.png -- 0.85kb -> 0.85kb (0.23%)

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